1. Which of the following sets of terms could be used in a description of the peripheral nervous system?
A. motor neuron, interneuron, sensory neuron
B. brain, sensory neuron, myelin
C. interneuron, spinal cord, autonomic
D. somatic, brain, spinal cord

2. Which of the following is not a function of the human nervous system?
A. regulating heartbeat
B. listening to music
C. moving oxygen from air into the blood
D. signaling the diaphragm to contract

3. Which of the following correctly describes how nerve impulses move throughout the body?
A. electrical transmission through neurons and electrical transmission between neurons
B. chemical transmission through neurons and chemical transmission between neurons
C. chemical transmission through neurons and electrical transmission between neurons
D. electrical transmission through neurons and chemical transmission between neurons

4. An external event stimulates a sensory nerve, which transmits a signal to an interneuron in the spinal cord. This stimulates a motor neuron, which stimulates a muscle to contract. Which of the following terms applies to the sequence of events described above?
A. voluntary motion
B. reflex
C. somatic response
D. synapse